919 resultados para third harmonic
Resumo:
The measurement deviations of cup anemometers are studied by analyzing the rotational speed of the rotor at steady state (constant wind speed). The differences of the measured rotational speed with respect to the averaged one based on complete turns of the rotor are produced by the harmonic terms of the rotational speed. Cup anemometer sampling periods include a certain number of complete turns of the rotor, plus one incomplete turn, the residuals from the harmonic terms integration within that incomplete turn (as part of the averaging process) being responsible for the mentioned deviations. The errors on the rotational speed due to the harmonic terms are studied analytically and then experimentally, with data from more than 500 calibrations performed on commercial anemometers.
Resumo:
La historia de la arquitectura se ha medido - en parte - por la evolución de las modas, épocas y estilos de la arquitectura religiosa. En la aparición de las nuevas capillas interreligiosas universitarias de los años '50 de Norteamérica, la capilla del M.I.T., bautizada tras su inauguración como “Kresge Chapel” en honor al apellido de su benefactor, fue el máximo exponente como prototipo en esta época marcada por la aparición nuevas conciencias de posguerra. (II Guerra Mundial). La tesis centra su investigación en esta capilla, cómo nació en respuesta a la necesidad de compatibilizar la enseñanza reglada científico tecnológica con una formación religiosa y humanista, para el programa impuesto como ampliación del campus universitario del MIT en el barrio universitario de Cambridge, Boston, Massachussets, en torno a dos edificios principales a proyectar: capilla y auditorio. Desde el trabajo de investigación se aporta la información documental necesaria para saber cómo evolucionó desde sus primeros bocetos hasta su construcción. Su nacimiento como necesidad en la sociedad universitaria no fue nada espontáneo, quedando a medias entre la influencia escandinavo - alemana y la tradición americano-luterana de anteriores iglesias neoclásicas herederas del “Plan Akron”. La formación académica y profesional dirigida por su padre, Eliel Saarinen, suman junto a los viajes del arquitecto, una herencia “genética” para con este prototipo ajeno al emergente “estilo internacional” y ayudan a comprender la dimensión compleja de lo que es capaz de representar la capilla. La capilla es refugio emocional de la luz y es un punto de inflexión notable en la recuperación del tipo centrado renovado y evolucionado, que junto con el doble recurso lumínico - efectista, de la vertical para el altar y horizontal inferior, distribuido desde el perímetro ondulado en el interior, el ejemplo es muestra la promoción de una cierta sensibilidad para con las nuevas formas de la "religión" emergentes en la Norteamérica de los años 50. Desde el sincretismo como mecanismo y principal “modus operandi” proyectual, FE versus RAZÓN, aparecen como dualismo permanente en todas las fases del proyecto, desde un proceso de búsqueda de la armonía de ambos y para cada uno de ellos. Con el estudio del modelo prototípico del MIT, buscamos el "patrón" empleado por el arquitecto en su proyección de "nueva iglesia" adaptado a la diversidad cultural y religiosa y de las nuevas y diferentes sensibilidades humanistas para el proyecto. ----------------------------------------------------- SUMMARY--------------------------------------------------- The history of architecture is measured - in part - by the evolution of fashion, periods and styles of religious architecture. In the emergence of the new interfaith university chapel of the 1950s in North America, the chapel of MIT, named after its inauguration as "Kresge Chapel" in honor of its benefactor, was the best example of a prototype, in this time so marked by the emergence of new postwar consciousnesses. The thesis focuses its research on this chapel; how it came about in response to the need to reconcile formal scientific and technological education with religious and humanist training for the program imposed as an extension of the campus of MIT in the university district of Cambridge, Boston Massachusetts, around two main projected buildings : Chapel and auditorium. From research work has been obtained the documentary information necessary to know how it evolved from the first sketches to its construction. Its creation as a necessity of the university society was not at all spontaneous, being halfway between the Scandinavian influence - German and the American Lutheran tradition of neoclassical churches, the heirs to the "Akron Plan". The academic and professional training directed by his father, Eliel Saarinen, together with the travels of the architect, a "genetic" heritage with this external prototype for the emerging "international style", and help to understand the complex dimension of what the chapel is capable of representing. The chapel is an emotional refuge of light and is a remarkable turning point in the recovery of such focused renewed and evolved, along with the double lumen resource - gimmicky, vertical to the altar and lower horizontal, distributed from the undulating perimeter inside, the example is shown to promote a certain sensitivity to the new forms of "religion" but vague religious profile emerging in the America of the 50s. From the syncretism as a mechanism and main "modus operandi" of the project, FAITH versus REASON appears as permanent dualism in all phases of the project from a process of finding the harmony of both and for each of them. With the study of the prototypical model of MIT, we seek the "pattern" used by the architect in his projection of "new church" adapted to the cultural and religious diversity and new and different humanist sensitivities for the project. El desarrollo vierte la luz suficiente para entender los patrones de lo arquitectónico en la capilla, que hacen de ella, la comunión armónica y perfecta de los nombrados opuestos en el campus universitario del MIT. En el camino, además, la investigación arroja luz y orden sobre las fases del proyecto a través de la contribución, recogida, clasificación y orden de los datos, fechas y documentos gráficos, a día de hoy dispersos y confusamente publicados, debido a la no existencia de un estudio profundo y completo como el que pretende ser este trabajo, por ser una obra fundamental en la historia de la arquitectura moderna. El patrón final demostrará el artificio sincrético de cada una de las partes - cada uno en sí misma y cosidas todas - formando el "Ima Summis" de la capilla; resultado de la acción proyectual deducida de su serie genética descifrada. De esta forma, lo sincrético, aparece como el principal atributo del hecho construido, pasando de lo místico a lo científico, de lo intuitivo a lo razonado y siempre con el vehículo de su arquitectura para la interpretación de lo inefable al interior. En cuanto a la estructura de la tesis, se inicia el desarrollo a partir de una introducción en la que se declaran las intenciones y se describe el contexto de lo investigado en torno a la hipótesis principal anunciada en el subtítulo de la tesis. Frente a consideraciones previas de la capilla y de la propia investigación, se expone y explica la hipótesis principal, junto a otros objetivos secundarios. Para finalizar la introducción, se describe el método seguido como estrategia y se justifica la estructura de redacción del documento para la compresión de este trabajo hacia sus conclusiones. Es en el primer capítulo, el C1, donde se inicia el cuerpo central mediante la exposición historiográfica de la situación y contexto previo a la capilla como antecedentes. En un segundo capítulo, el C2, se aborda el estudio del desarrollo del proyecto y de la obra y construcción de la capilla, base documental necesaria. Para ello se inicia con la descripción del lugar, del encargo y del programa, para pasar a mostrar con detalle las distintas propuestas de cada una de las fases del proyecto. En definitiva, qué se proyecto, cómo evolucionó el proyecto y en qué fases transcurrió, para entre otras cuestiones, entender el cambio de estilo desde una fase influenciada por la capilla de Mies construida en el ITT de Chicago, (denominadas en este trabajo por esta influencia como modelos “miesianos”) y la fase reencuentro con el modus de hacer iniciado por su padre Eliel, a través de un modelo a medias de una herencia escandinavo - alemana y la tradición luterano - americana, (denominada en este trabajo como herencia o modelos “saariniana/os”). The development sheds enough light to understand the architectural patterns of the chapel, making it the perfect and harmonic communion named opposites on the campus of MIT. Along the way, furthermore, the research sheds light and order on the phases of the project through the contribution, collection, sorting and order of data, dates and graphic documents, today scattered and confusingly published, due to inexistence of a deep and comprehensive study like this work is meant to be, in the context of such a seminal work in the history of modern architecture. The final pattern will demonstrate the syncretic artifice of each of the parts - each in itself and all together - forming the "Ima Summis" of the chapel; the result of the project action deducted from its deciphered genetic series. Being the SYNCRETIC, the main attribute of the built matter, passing from the mystical to the scientific, from the intuitive to the reasoned and always with the vehicle of architecture as the representation of the ineffable. As for the structure of the thesis, the development starts from an introduction in which the intentions are declared and the context of that which is investigated is described, in terms of the main hypothesis announced in the subtitle of the thesis. Faced with previous considerations of the chapel and the research itself, the principal hypothesis is expressed and explained, along with other secondary objectives. To conclude the introduction, the method followed is described as a strategy and the structuring of the document is justified for the compression of this work towards its conclusions. It is in the first chapter of the thesis, the C1, where the main body of the work is initiated through the historiographical account of the situation and context prior to the chapel as antecedents. A second chapter, C2, addresses the study of the development of the project and of the work and construction of the chapel, based on the necessary documentary evidence. To this end, the analysis begins with the description of the place, the commission and the program, moving on to analyze in detail the various proposals of each phase. What is projected, how it evolved and through what phases passed the project to, among other questions, understand the change in style between the phase of influence of Mies through the projected chapel in the ITT of Chicago chapel (called in this work as "miesian" influences or models) and the reunion with the modus of making initiated by his father Eliel, through a model equally at once of Scandinavian-German heritage and of the American-Lutheran tradition, (referred to in this work as "saarinian" inheritance or models). Para el tercer capítulo, el C3, se llevan a estudio y análisis, los elementos más destacables en los que se prueban las particularidades llamadas “genéticas” en cada uno de las partes principales detectadas en la capilla. Desde ellas se rastrean las influencias - a veces sinergias - que ayudan a justificar y conformar una clasificación genética en torno a cuatro patrones principales, de los que poder discernir al final del capítulo, el “patrón matriz” de la propia capilla en base a la concurrencia de los órdenes arquitectónicos que los conforman. Una vez obtenida la información y orden necesario, se puede afrontar el punto álgido de esta tesis con el cuarto capítulo, el C4, en el que se justifica la capacidad sincrética de la capilla como respuesta a la hipótesis principal señalada en el subtítulo. Para ello se inicia el capítulo con el enfoque y contexto del término “sincretismo” y “sincrético”, aportando la justificación de sus usos para con esta investigación, antes de explicar que la capilla es sincrética por la suma de dos claves fundamentales. La clave primera, correspondiente a la capacidad interconfesional y aconfesional de la capilla, y su capacidad de trascender al interior desde ambas situaciones además de ser reconocible por el religioso y a la vez por el científico. Y la clave segunda, que corresponde a la suma de las distintas partes sincréticas, cada una en si mismas, capaz de sumar todas juntas, este edificio sincrético de los nombrados opuestos. Una vez discernido las claves de lo sincrético en la capilla y a pesar de su doble carácter SACRO Y PROFANO, una comparativa posiciona a la capilla como único entre los ejemplos interconfesionales construidos en los ´50, sin haberse repetido de igual manera y mismo resultado en el tiempo, ni en ninguna otra universidad o centro tecnológico. Así la exposición de este trabajo finaliza con el último capítulo, el C5, en el que desde esa comparativa, una serie de cuestiones unen y distancian a la del MIT y dan acierto a la apuesta inicial, concluyendo que la hipótesis y el patrón de la misma, es el patrón de lo sincrético que modela el ”modus operandi ” del arquitecto. Tras el desarrollo, la investigación cierra filas en torno a cuatro conclusiones para los cuatro capítulos principales; C2, C3, C4, C5. La capilla del MIT como modelo prototípico no se repite en el tiempo, ni en ninguna otra universidad y se posiciona como el mejor prototipo – hito de una nueva arquitectura religiosa universitaria. In the third chapter, C3, we study and analyze the most notable elements in which are found those particularities referred to as "genetic" in each of the principal parts, (see above C3.1.1... - C3.1.8), where these influences - sometimes synergies - are traced, helping to justify and form a classification based on four of those principals (see above C3.2), from which, at the end of this chapter may be discerned a matrix pattern, that of the chapel itself (see above. C3.3.), based on concurrent architectural orders. Once the necessary information and order is obtained, we come to the decisive point in the fourth chapter, C4, where the syncretic capacity of the chapel in response to the main hypothesis indicated in the subtitle of the thesis is justified. For this, the chapter beings with the focus and context of the terms "syncretism" and "syncretic", providing justification for their use for this research, going on to assert that the chapel is syncretic from the sum of two fundamental aspects: the first corresponds to the interfaith and non-denominational capacities of the chapel, its ability to transcend both situations and be recognizable by both the religious and the scientific. The second corresponds to the sum of the different syncretic parts, each in themselves, capable of making together a syncretic building with the opposite. Once discerned the keys to the syncretic and epic in the chapel and despite its dual character both SACRED and PROFANE, a comparatison positions the chapel as being unique among interfaith examples built in the 1950s, without being repeated in the same way and with the same result over time or in any other university or centre of technology. So, the exhibition of this work ends with the last chapter, C5, in which from that comparison a number of issues come together and to distance themselves from MIT and bear out the initial proposition, concluding that the hypothesis and its pattern, the pattern of the syncretic which models the "modus operandi" of the architect to contain the ineffable. The research closes ranks around four conclusions for the four main chapters; C2, C3, C4, and C5 The chapel of MIT as a prototypical model is not repeated in time, or any other university and is positioned as the best prototype - a landmark of a new universitary religious architecture.
Resumo:
3rd.
Resumo:
1st & 2nd
Resumo:
The usually reserved and shy scholar made a name for himself at Lincoln; joining the Alpha Phi Alpha social fraternity and becoming a member of the History Club and the Student Government, where he served as President for his senior class.
Resumo:
Multiple human skeletal and craniosynostosis disorders, including Crouzon, Pfeiffer, Jackson–Weiss, and Apert syndromes, result from numerous point mutations in the extracellular region of fibroblast growth factor receptor 2 (FGFR2). Many of these mutations create a free cysteine residue that potentially leads to abnormal disulfide bond formation and receptor activation; however, for noncysteine mutations, the mechanism of receptor activation remains unclear. We examined the effect of two of these mutations, W290G and T341P, on receptor dimerization and activation. These mutations resulted in cellular transformation when expressed as FGFR2/Neu chimeric receptors. Additionally, in full-length FGFR2, the mutations induced receptor dimerization and elevated levels of tyrosine kinase activity. Interestingly, transformation by the chimeric receptors, dimerization, and enhanced kinase activity were all abolished if either the W290G or the T341P mutation was expressed in conjunction with mutations that eliminate the disulfide bond in the third immunoglobulin-like domain (Ig-3). These results demonstrate a requirement for the Ig-3 cysteine residues in the activation of FGFR2 by noncysteine mutations. Molecular modeling also reveals that noncysteine mutations may activate FGFR2 by altering the conformation of the Ig-3 domain near the disulfide bond, preventing the formation of an intramolecular bond. This allows the unbonded cysteine residues to participate in intermolecular disulfide bonding, resulting in constitutive activation of the receptor.
Resumo:
Synapsins are a family of neuron-specific synaptic vesicle-associated phosphoproteins that have been implicated in synaptogenesis and in the modulation of neurotransmitter release. In mammals, distinct genes for synapsins I and II have been identified, each of which gives rise to two alternatively spliced isoforms. We have now cloned and characterized a third member of the synapsin gene family, synapsin III, from human DNA. Synapsin III gives rise to at least one protein isoform, designated synapsin IIIa, in several mammalian species. Synapsin IIIa is associated with synaptic vesicles, and its expression appears to be neuron-specific. The primary structure of synapsin IIIa conforms to the domain model previously described for the synapsin family, with domains A, C, and E exhibiting the highest degree of conservation. Synapsin IIIa contains a novel domain, termed domain J, located between domains C and E. The similarities among synapsins I, II, and III in domain organization, neuron-specific expression, and subcellular localization suggest a possible role for synapsin III in the regulation of neurotransmitter release and synaptogenesis. The human synapsin III gene is located on chromosome 22q12–13, which has been identified as a possible schizophrenia susceptibility locus. On the basis of this localization and the well established neurobiological roles of the synapsins, synapsin III represents a candidate gene for schizophrenia.
Resumo:
Peer reviewed
Resumo:
The crystal structure of raite was solved and refined from data collected at Beamline Insertion Device 13 at the European Synchrotron Radiation Facility, using a 3 × 3 × 65 μm single crystal. The refined lattice constants of the monoclinic unit cell are a = 15.1(1) Å; b = 17.6(1) Å; c = 5.290(4) Å; β = 100.5(2)°; space group C2/m. The structure, including all reflections, refined to a final R = 0.07. Raite occurs in hyperalkaline rocks from the Kola peninsula, Russia. The structure consists of alternating layers of a hexagonal chicken-wire pattern of 6-membered SiO4 rings. Tetrahedral apices of a chain of Si six-rings, parallel to the c-axis, alternate in pointing up and down. Two six-ring Si layers are connected by edge-sharing octahedral bands of Na+ and Mn3+ also parallel to c. The band consists of the alternation of finite Mn–Mn and Na–Mn–Na chains. As a consequence of the misfit between octahedral and tetrahedral elements, regions of the Si–O layers are arched and form one-dimensional channels bounded by 12 Si tetrahedra and 2 Na octahedra. The channels along the short c-axis in raite are filled by isolated Na(OH,H2O)6 octahedra. The distorted octahedrally coordinated Ti4+ also resides in the channel and provides the weak linkage of these isolated Na octahedra and the mixed octahedral tetrahedral framework. Raite is structurally related to intersilite, palygorskite, sepiolite, and amphibole.
Resumo:
p53 tumor suppressor protein negatively regulates cell growth, mainly through the transactivation of its downstream target genes. As a sequence-specific DNA binding transcription factor, p53 specifically binds to a 20-bp consensus motif 5′-PuPuPuC(A/T) (T/A)GPyPyPyPuPuPuC(A/T)(T/A)GPyPyPy-3′. We have now identified, partially purified, and characterized an additional ≈40-kDa nuclear protein, p53CP (p53 competing protein), that specifically binds to the consensus p53 binding sites found in several p53 downstream target genes, including Waf-1, Gadd45, Mdm2, Bax, and RGC. The minimal sequence requirement for binding is a 14-bp motif, 5′-CTTGCTTGAACAGG-3′ [5′-C(A/T)(T/A)GPyPyPyPuPuPuC(A/T)(T/A)G-3′], which includes the central nucleotides of the typical p53 binding site with one mismatch. p53CP and p53 (complexed with antibody) showed a similar binding specificity to Waf-1 site but differences in Gadd45 and T3SF binding. Like p53, p53CP also binds both double- and single-stranded DNA oligonucleotides. Important to note, cell cycle blockers and DNA damaging reagents, which induce p53 binding activity, were found to inhibit p53CP binding in p53-positive, but not in p53-negative, cells. This finding suggested a p53-dependent coordinate regulation of p53 and p53CP in response to external stimuli. p53CP therefore could be a third member of the p53 family, in addition to p53 and p73, a newly identified p53 homolog. p53CP, if sequestering p53 from its DNA binding sites through competitive binding, may provide a novel mechanism of p53 inactivation. Alternatively, p53CP may have p53-like functions by binding and transactivating p53 downstream target genes. Cloning of the p53CP gene ultimately will resolve this issue.
Resumo:
This paper describes three distinct estrogen receptor (ER) subtypes: ERα, ERβ, and a unique type, ERγ, cloned from a teleost fish, the Atlantic croaker Micropogonias undulatus; the first identification of a third type of classical ER in vertebrate species. Phylogenetic analysis shows that ERγ arose through gene duplication from ERβ early in the teleost lineage and indicates that ERγ is present in other teleosts, although it has not been recognized as such. The Atlantic croaker ERγ shows amino acid differences in regions important for ligand binding and receptor activation that are conserved in all other ERγs. The three ER subtypes are genetically distinct and have different distribution patterns in Atlantic croaker tissues. In addition, ERβ and ERγ fusion proteins can each bind estradiol-17β with high affinity. The presence of three functional ERs in one species expands the role of ER multiplicity in estrogen signaling systems and provides a unique opportunity to investigate the dynamics and mechanisms of ER evolution.
Resumo:
Lysyl hydroxylase (EC 1.14.11.4), a homodimer, catalyzes the formation of hydroxylysine in collagens. Recently, an isoenzyme termed lysyl hydroxylase 2 has been cloned from human sources [M. Valtavaara, H. Papponen, A.-M. Pirttilä, K. Hiltunen, H. Helander and R. Myllylä (1997) J. Biol. Chem. 272, 6831–6834]. We report here on the cloning of a third human lysyl hydroxylase isoenzyme, termed lysyl hydroxylase 3. The cDNA clones encode a 738 amino acid polypeptide, including a signal peptide of 24 residues. The overall amino acid sequence identity between the processed human lysyl hydroxylase 3 and 1 polypeptides is 59%, and that between the processed lysyl hydroxylase 3 and 2 polypeptides is 57%, whereas the identity to the processed Caenorhabditis elegans polypeptide is only 45%. All four recently identified critical residues at the catalytic site, two histidines, one aspartate, and one arginine, are conserved in all these polypeptides. The mRNA for lysyl hydroxylase 3 was found to be expressed in a variety of tissues, but distinct differences appear to exist in the expression patterns of the three isoenzyme mRNAs. Recombinant lysyl hydroxylase 3 expressed in insect cells by means of a baculovirus vector was found to be more soluble than lysyl hydroxylase 1 expressed in the same cell type. No differences in catalytic properties were found between the recombinant lysyl hydroxylase 3 and 1 isoenzymes. Deficiency in lysyl hydroxylase 1 activity is known to cause the type VI variant of the Ehlers–Danlos syndrome, and it is therefore possible that deficiency in lysyl hydroxylase 3 activity may lead to some other variant of this syndrome or to some other heritable connective tissue disorder.